Nautical blog

Through-hull vs transom-mount depth sounders — which choice for your 2026 sailboat

The choice between through-hull and transom-mount depth sounders determines the accuracy of measurements (depth, speed, temperature) for 10-15 years. Through-hull = maximum precision, heavy installation, dry dock required. Transom-mount = installation simplicity, 10-15% precision loss depending on point of sail. Technical comparison, Airmar/Raymarine/B&G brands, real-world examples for 30-50-foot sailboats.